Dog biscuit



FIG. 1 is a top view of the design.

FIG. 2 is a side view thereof (the opposite side is a mirror image).

FIG. 3 is a bottom view thereof; and,

FIG. 4 is a cross-sectional view thereof taken along the line 4—4 shown in FIG. 1. 

The ornamental design for a dog biscuit, as shown and described. 